Antenna device and electronic device having the same

Abstract

Disclosed are an antenna device and an electronic device that includes the antenna device. The antenna device includes a power feeding unit, a ground unit, a radiating unit that is electrically connected to the power feeding unit, and a switching element that selects one or more points from a plurality of different points of the ground unit and connects the radiating unit to the selected one or more points.

What is claimed is: 
     
       1. An antenna device comprising:
 a power feeding unit; 
 a ground unit; 
 a radiating unit that is electrically connected to the power feeding unit; 
 a feeding line connecting the power feeding unit to the radiating unit; 
 a junction provided on the feeding line, and positioned between the power feeding unit and the radiating unit; and 
 a switching element comprising a first terminal and a plurality of second terminals, 
 wherein the switching element is configured to select one or more points from a plurality of different points on the ground unit and connect the junction to the selected one or more points, 
 wherein the junction connects the radiating unit to the feeding line and connects the radiating unit to the switching element, 
 wherein the switching element is configured to connect the radiating unit to the ground unit by connecting the first terminal to any one second terminal of the plurality of second terminals, and 
 wherein the radiating unit is a conductive region of a case of an electronic device housing the antenna device. 
 
     
     
       2. The antenna device of  claim 1 , wherein the first terminal is connected to the junction between the power feeding unit and the radiating unit. 
     
     
       3. The antenna device of  claim 2 , wherein the plurality of second terminals are arranged to correspond to the different points on the ground unit, respectively. 
     
     
       4. The antenna device of  claim 3 , wherein an electric length of the radiating unit is set depending on a position of the second terminal that is connected to the first terminal. 
     
     
       5. The antenna device of  claim 2 , wherein the ground unit includes a first ground portion that extends in one direction, a second ground portion that extends from the first ground portion, and a third ground portion that extends from the second ground portion and is arranged to be adjacent to the first ground portion. 
     
     
       6. The antenna device of  claim 5 , wherein an electric length of the radiating unit is set depending on a position of the second terminal that is connected to the first terminal. 
     
     
       7. The antenna device of  claim 5 , wherein the plurality of different points on the ground unit are arranged around the switching element. 
     
     
       8. The antenna device of  claim 5 , further comprising:
 a circuit board that includes a conductive region that is provided with the ground unit, and a non-conductive region that is formed among the first, second and third ground portions. 
 
     
     
       9. The antenna device of  claim 1 , further comprising:
 a circuit board that includes a non-conductive region and a conductive region, 
 wherein the conductive region includes a ground unit that encloses at least a portion of the non-conductive region. 
 
     
     
       10. The antenna device of  claim 9 , wherein the plurality of different points of the ground unit are positioned at a location where the non-conductive region and the conductive region are in contact with each other. 
     
     
       11. An electronic device comprising:
 a case; 
 a processor; and 
 an antenna device including: 
 a power feeding unit, 
 a ground unit, 
 a radiating unit formed as a conductive part of the case and electrically connected to the power feeding unit, 
 a feeding line connecting the power feeding unit to the radiating unit; 
 a junction provided on the feeding line, and positioned between the power feeding unit and the radiating unit, and 
 a switching element comprising a first terminal and a plurality of second terminals, 
 wherein the switching element is configured to select one or more points from a plurality of different points on the ground unit and connect the junction to the selected one or more points of the ground unit, and is further configured to connect the radiating unit to the ground unit by connecting the first terminal to any one second terminal of the plurality of second terminals, 
 wherein the junction connects the radiating unit to the feeding line and connects the radiating unit to the switching element, and 
 wherein the processor adjusts a resonance frequency of the antenna device by operating the switching element. 
 
     
     
       12. The electronic device of  claim 11 , wherein the first terminal is connected to the junction between the power feeding unit and the radiating unit. 
     
     
       13. The electronic device of  claim 12 , wherein the ground unit includes a first ground portion that extends in one direction, a second ground portion that extends from the first ground portion, and a third ground portion that extends from the second ground portion parallel to the first ground portion, and
 wherein the plurality of second terminals are arranged to correspond to the different points on the ground unit, respectively, and the first terminal is selectively connected to one of the second terminals. 
 
     
     
       14. The electronic device of  claim 13 , further comprising:
 a circuit board that includes a conductive region that is provided with the ground unit, and a non-conductive region that is formed among the first, second and third ground portions. 
 
     
     
       15. The electronic device of  claim 11 , further comprising:
 a circuit board that includes a non-conductive region and a conductive region, 
 wherein the conductive region includes a ground unit that encloses at least a portion of the non-conductive region. 
 
     
     
       16. The electronic device of  claim 15 , wherein the plurality of different points on the ground unit are positioned at a location where the non-conductive region and the conductive region are in contact with each other. 
     
     
       17. The electronic device of  claim 11 , wherein the plurality of different points on the ground unit are arranged around the switching element. 
     
     
       18. An antenna device comprising:
 a power feeding unit; 
 a ground unit provided on a circuit board; 
 a radiating unit that is electrically connected to the power feeding unit; 
 a feeding line connecting the power feeding unit to the radiating unit; 
 a junction provided on the feeding line, and positioned between the power feeding unit and the radiating unit; and 
 a switching element that selects one or more points from a plurality of different points on the ground unit and connects the junction to the selected one or more points on the ground unit, and 
 wherein the junction connects the radiating unit to the feeding line and connects the radiating unit to the switching element, 
 wherein the ground unit includes a first ground portion that extends in one direction, a second ground portion that extends from the first ground portion, and a third ground portion that extends from the second ground portion and is arranged to be adjacent to the first ground portion in a square or rectangular C shape, 
 wherein a first and a second point among the plurality of different points are positioned on the first ground portion, and a third point among the plurality of different points is positioned on the third ground portion of the ground unit, respectively, and 
 wherein the radiating unit is a conductive region of a case of an electronic device housing the antenna device.